Thanks Mike,
More than in a hurry, i am so new in this topic, so i was not sure how to call the subroutine....
I did´t (in really i still don´t) understand why you send a current in one way, take a measurement, and later allow a current in the opposite way... to reduce the electrolysis effect in the soil?.
Thanks for your kind the improvement. I will check as soon as possible.
And about your project, my idea is also to measure ones per hour. So i am thinking different possibilities, such as to use a DS1307 RTC, but i don´t know if this is the better option. What method do you use?
Cheers!